
<h1><span class="yiyi-st" id="yiyi-13">numpy.ma.is_masked</span></h1>
        <blockquote>
        <p>原文：<a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.ma.is_masked.html">https://docs.scipy.org/doc/numpy/reference/generated/numpy.ma.is_masked.html</a></p>
        <p>译者：<a href="https://github.com/wizardforcel">飞龙</a> <a href="http://usyiyi.cn/">UsyiyiCN</a></p>
        <p>校对：（虚位以待）</p>
        </blockquote>
    
<dl class="function">
<dt id="numpy.ma.is_masked"><span class="yiyi-st" id="yiyi-14"> <code class="descclassname">numpy.ma.</code><code class="descname">is_masked</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="reference external" href="http://github.com/numpy/numpy/blob/v1.11.3/numpy/ma/core.py#L6156-L6206"><span class="viewcode-link">[source]</span></a></span></dt>
<dd><p><span class="yiyi-st" id="yiyi-15">确定输入是否具有屏蔽值。</span></p>
<p><span class="yiyi-st" id="yiyi-16">接受任何对象作为输入，但始终返回False，除非输入是包含掩码值的MaskedArray。</span></p>
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<tr class="field-odd field"><th class="field-name"><span class="yiyi-st" id="yiyi-17">参数：</span></th><td class="field-body"><p class="first"><span class="yiyi-st" id="yiyi-18"><strong>x</strong>：array_like</span></p>
<blockquote>
<div><p><span class="yiyi-st" id="yiyi-19">数组来检查屏蔽值。</span></p>
</div></blockquote>
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<tr class="field-even field"><th class="field-name"><span class="yiyi-st" id="yiyi-20">返回：</span></th><td class="field-body"><p class="first"><span class="yiyi-st" id="yiyi-21"><strong>result</strong>：bool</span></p>
<blockquote class="last">
<div><p><span class="yiyi-st" id="yiyi-22">如果<em class="xref py py-obj">x</em>是带有掩码值的MaskedArray，则为真，否则为False。</span></p>
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<p class="rubric"><span class="yiyi-st" id="yiyi-23">例子</span></p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="kn">import</span> <span class="nn">numpy.ma</span> <span class="k">as</span> <span class="nn">ma</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">x</span> <span class="o">=</span> <span class="n">ma</span><span class="o">.</span><span class="n">masked_equal</span><span class="p">([</span><span class="mi">0</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">],</span> <span class="mi">0</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">x</span>
<span class="go">masked_array(data = [-- 1 -- 2 3],</span>
<span class="go">      mask = [ True False  True False False],</span>
<span class="go">      fill_value=999999)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">ma</span><span class="o">.</span><span class="n">is_masked</span><span class="p">(</span><span class="n">x</span><span class="p">)</span>
<span class="go">True</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">x</span> <span class="o">=</span> <span class="n">ma</span><span class="o">.</span><span class="n">masked_equal</span><span class="p">([</span><span class="mi">0</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">],</span> <span class="mi">42</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">x</span>
<span class="go">masked_array(data = [0 1 0 2 3],</span>
<span class="go">      mask = False,</span>
<span class="go">      fill_value=999999)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">ma</span><span class="o">.</span><span class="n">is_masked</span><span class="p">(</span><span class="n">x</span><span class="p">)</span>
<span class="go">False</span>
</pre></div>
</div>
<p><span class="yiyi-st" id="yiyi-24">如果<em class="xref py py-obj">x</em>不是MaskedArray，则始终返回False。</span></p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="n">x</span> <span class="o">=</span> <span class="p">[</span><span class="kc">False</span><span class="p">,</span> <span class="kc">True</span><span class="p">,</span> <span class="kc">False</span><span class="p">]</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">ma</span><span class="o">.</span><span class="n">is_masked</span><span class="p">(</span><span class="n">x</span><span class="p">)</span>
<span class="go">False</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">x</span> <span class="o">=</span> <span class="s1">&apos;a string&apos;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">ma</span><span class="o">.</span><span class="n">is_masked</span><span class="p">(</span><span class="n">x</span><span class="p">)</span>
<span class="go">False</span>
</pre></div>
</div>
</dd></dl>
